57211903 has 16 divisors (see below), whose sum is σ = 66803200. Its totient is φ = 47985696.

The previous prime is 57211897. The next prime is 57211909. The reversal of 57211903 is 30911275.

It is an interprime number because it is at equal distance from previous prime (57211897) and next prime (57211909).

It is a 5-Lehmer number, since φ(57211903) divides (57211903-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 57211903 - 2²⁵ = 23657471 is a prime.

It is a deceptive number, since it divides R_57211902.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57211909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93025 + ... + 93637.

It is an arithmetic number, because the mean of its divisors is an integer number (4175200).

Almost surely, 2^57211903 is an apocalyptic number.

57211903 is a deficient number, since it is larger than the sum of its proper divisors (9591297).

57211903 is a wasteful number, since it uses less digits than its factorization.

57211903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 57211903 is about 7563.8550356283. The cubic root of 57211903 is about 385.3264291742.

The spelling of 57211903 in words is "fifty-seven million, two hundred eleven thousand, nine hundred three".